Re: GNU assembler freaks out at jumps and Intel syntax
Re: GNU assembler freaks out at jumps and Intel syntax
- Subject: Re: GNU assembler freaks out at jumps and Intel syntax
- From: LuigiG <email@hidden>
- Date: Mon, 15 Sep 2008 16:46:24 -0700 (PDT)
Not quite sure what you mean with that, is the AT&T syntax more "logical" for any particular reason?
Anyway, my reason is a compiler emitting asm (Intel syntax), I'd planned to use gas a back-end. It needs to able to address labels at any arbitrary position in the source, therefore the 1b/1f isn't good enough.
Though I cannot find any specific reference in the docs concering use of "j<cc>" instructions when using intel syntax ,this is starting to look like a bug in gas itself. I'll give a shot at the binutils mailing list.
Thanks anyway.
Luigi
--- On Tue, 9/16/08, Terry Lambert <email@hidden> wrote:
> From: Terry Lambert <email@hidden>
> Subject: Re: GNU assembler freaks out at jumps and Intel syntax
> To: email@hidden
> Cc: email@hidden
> Date: Tuesday, September 16, 2008, 1:26 AM
> Ah, you have some reason other than logic for using Intel
> syntax.
>
> Change it to this:
>
> 1:
> L5:
> popl ëx
> cmpl $2, 8(ëp)
> je L2
> leal LC0-"L00000000001$pb"(ëx), êx
> movl êx, (%esp)
> call L_puts$stub
> .intel_syntax noprefix
> test êx, êx
> jnz 1b
> .att_syntax
>
> -- Terry
>
>
> On Sep 15, 2008, at 4:15 PM, LuigiG wrote:
> > But that's using the AT&T syntax. That has
> always worked fine for me
> > too, it's only when you switch to Intel syntax
> that you get problems.
> >
> > If I chnage your example to use Intel syntax (even
> limited to that
> > small bit of code), it doesn't work anymore:
> >
> > This assembles (and links) correctly:
> > testl êx,êx
> > jnz L5
> >
> > This will fail:
> > .intel_syntax noprefix
> > test eax,eax
> > jnz L5
> > .att_syntax
> >
> > foo.s:28:suffix or operands invalid for `jnz'
> >
> > So, is this a bug in gas? Or must I prepend/append
> something "L5"
> > when using Intel syntax? (which would seem to
> contradict the
> > "noprefix" option!)
> >
> > Luigi
> >
> > Note: I'm on an intel Mac and both -arch i386 and
> -arch x86_64 give
> > the same result.
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